Vitamin D is also called the sunshine vitamin because the body produces it when the skin is exposed to the sun. Some people have vitamin D deficiencies because of their lack of sun exposure or geographical location. Vitamin D 5000 is designed to help support calcium absorption and bone health, as well as provide nutritive support for healthy immune function. Use only as directed. Take 1 softgel per day or as directed by a healthcare practitioner. Keep tighty capped and store in a cool, dry place. The ongoing commitment to quality, innovation, and efficacy is what sets Nutra BioGenesis products apart and has made us a leader in the nutraceutical industry today.